Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99138dbe0fd4db2…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 10:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c898b5f6fce5a7f7d4e100baaf4a601a SHA-1: 4cb64e6c5a385a9775aa19e4fe2a2c57592db36d SHA-256: a99138dbe0fd4db20fc84bf8b87392d1e417a602d5862155f567586d2c12e155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=humminbird+859ci+hd+di+reviews PDF link annotation
    • http://rkconstructionsucks.com/grim_dawn_kymons_chosenshg6g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fdde8bd1487e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_6027531ecbb97.pdfIn PDF document text
    • http://domastmsk.space/cab_driver_uniform_challan3c6ks.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/hack_driver_question_answers.pdfIn PDF document text
    • http://shoop-ft.ru/4th_grade_math_word_problems_worksheets_freebh6m1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fe97a1c44a49.pdfIn PDF document text
    • http://kindraretterath.com/copd_treatment_guidelines_aafp44out.pdfIn PDF document text
    • http://remastacer.com/t-fal_gc722d53_1800w_optigrill_xl_reviewbu72c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5fcc7c9c149b9.pdfIn PDF document text
    • http://navalny.design/kedebedyw8xw.pdfIn PDF document text
    • http://shoop-fo.ru/53324173345ho2uw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxepuvusak.rf.gd/how_to_read_transthoracic_echocardiogram_report.pdfIn PDF document text
    • http://karajifaderiwow.epizy.com/poison_frogs_leaf_litter_answers.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/saturated_steam_vs_superheated_steam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 5664 bytes
SHA-256: 3d3a1e0169ced773c07cd7bec305cb1155372583518eeebe822438d907300926
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 10656 bytes
SHA-256: 525f5ec902bfd305ab8b0c6d3793f502fc7f5cee041da089a50d6982c8c2c9d4

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